Loooooong shutterspeed will give you lots of fireworks. while a short shutterspeed will only draw a little on the dark shot.

Put you digicam on a tripod and point it a the place, where you think most rockets and so will explooooode.

good luck.

(The best shots is, if you are able to get something more than only the fireworks on the shot, i.e some people silouettes in the bottom of the frame or so.) many shots of only the fireworks alone will be boring in the end.